1 /*
2 * Copyright (C) 2007-2010 ST-Ericsson
3 * License terms: GNU General Public License (GPL) version 2
4 * Low-level core for exclusive access to the AB3100 IC on the I2C bus
5 * and some basic chip-configuration.
6 * Author: Linus Walleij <linus.walleij@stericsson.com>
7 */
8
9 #include <linux/i2c.h>
10 #include <linux/mutex.h>
11 #include <linux/list.h>
12 #include <linux/notifier.h>
13 #include <linux/slab.h>
14 #include <linux/err.h>
15 #include <linux/module.h>
16 #include <linux/platform_device.h>
17 #include <linux/device.h>
18 #include <linux/interrupt.h>
19 #include <linux/random.h>
20 #include <linux/debugfs.h>
21 #include <linux/seq_file.h>
22 #include <linux/uaccess.h>
23 #include <linux/mfd/core.h>
24 #include <linux/mfd/ab3100.h>
25 #include <linux/mfd/abx500.h>
26
27 /* These are the only registers inside AB3100 used in this main file */
28
29 /* Interrupt event registers */
30 #define AB3100_EVENTA1 0x21
31 #define AB3100_EVENTA2 0x22
32 #define AB3100_EVENTA3 0x23
33
34 /* AB3100 DAC converter registers */
35 #define AB3100_DIS 0x00
36 #define AB3100_D0C 0x01
37 #define AB3100_D1C 0x02
38 #define AB3100_D2C 0x03
39 #define AB3100_D3C 0x04
40
41 /* Chip ID register */
42 #define AB3100_CID 0x20
43
44 /* AB3100 interrupt registers */
45 #define AB3100_IMRA1 0x24
46 #define AB3100_IMRA2 0x25
47 #define AB3100_IMRA3 0x26
48 #define AB3100_IMRB1 0x2B
49 #define AB3100_IMRB2 0x2C
50 #define AB3100_IMRB3 0x2D
51
52 /* System Power Monitoring and control registers */
53 #define AB3100_MCA 0x2E
54 #define AB3100_MCB 0x2F
55
56 /* SIM power up */
57 #define AB3100_SUP 0x50
58
59 /*
60 * I2C communication
61 *
62 * The AB3100 is usually assigned address 0x48 (7-bit)
63 * The chip is defined in the platform i2c_board_data section.
64 */
ab3100_get_chip_id(struct device * dev)65 static int ab3100_get_chip_id(struct device *dev)
66 {
67 struct ab3100 *ab3100 = dev_get_drvdata(dev->parent);
68
69 return (int)ab3100->chip_id;
70 }
71
ab3100_set_register_interruptible(struct ab3100 * ab3100,u8 reg,u8 regval)72 static int ab3100_set_register_interruptible(struct ab3100 *ab3100,
73 u8 reg, u8 regval)
74 {
75 u8 regandval[2] = {reg, regval};
76 int err;
77
78 err = mutex_lock_interruptible(&ab3100->access_mutex);
79 if (err)
80 return err;
81
82 /*
83 * A two-byte write message with the first byte containing the register
84 * number and the second byte containing the value to be written
85 * effectively sets a register in the AB3100.
86 */
87 err = i2c_master_send(ab3100->i2c_client, regandval, 2);
88 if (err < 0) {
89 dev_err(ab3100->dev,
90 "write error (write register): %d\n",
91 err);
92 } else if (err != 2) {
93 dev_err(ab3100->dev,
94 "write error (write register)\n"
95 " %d bytes transferred (expected 2)\n",
96 err);
97 err = -EIO;
98 } else {
99 /* All is well */
100 err = 0;
101 }
102 mutex_unlock(&ab3100->access_mutex);
103 return err;
104 }
105
set_register_interruptible(struct device * dev,u8 bank,u8 reg,u8 value)106 static int set_register_interruptible(struct device *dev,
107 u8 bank, u8 reg, u8 value)
108 {
109 struct ab3100 *ab3100 = dev_get_drvdata(dev->parent);
110
111 return ab3100_set_register_interruptible(ab3100, reg, value);
112 }
113
114 /*
115 * The test registers exist at an I2C bus address up one
116 * from the ordinary base. They are not supposed to be used
117 * in production code, but sometimes you have to do that
118 * anyway. It's currently only used from this file so declare
119 * it static and do not export.
120 */
ab3100_set_test_register_interruptible(struct ab3100 * ab3100,u8 reg,u8 regval)121 static int ab3100_set_test_register_interruptible(struct ab3100 *ab3100,
122 u8 reg, u8 regval)
123 {
124 u8 regandval[2] = {reg, regval};
125 int err;
126
127 err = mutex_lock_interruptible(&ab3100->access_mutex);
128 if (err)
129 return err;
130
131 err = i2c_master_send(ab3100->testreg_client, regandval, 2);
132 if (err < 0) {
133 dev_err(ab3100->dev,
134 "write error (write test register): %d\n",
135 err);
136 } else if (err != 2) {
137 dev_err(ab3100->dev,
138 "write error (write test register)\n"
139 " %d bytes transferred (expected 2)\n",
140 err);
141 err = -EIO;
142 } else {
143 /* All is well */
144 err = 0;
145 }
146 mutex_unlock(&ab3100->access_mutex);
147
148 return err;
149 }
150
ab3100_get_register_interruptible(struct ab3100 * ab3100,u8 reg,u8 * regval)151 static int ab3100_get_register_interruptible(struct ab3100 *ab3100,
152 u8 reg, u8 *regval)
153 {
154 int err;
155
156 err = mutex_lock_interruptible(&ab3100->access_mutex);
157 if (err)
158 return err;
159
160 /*
161 * AB3100 require an I2C "stop" command between each message, else
162 * it will not work. The only way of achieveing this with the
163 * message transport layer is to send the read and write messages
164 * separately.
165 */
166 err = i2c_master_send(ab3100->i2c_client, ®, 1);
167 if (err < 0) {
168 dev_err(ab3100->dev,
169 "write error (send register address): %d\n",
170 err);
171 goto get_reg_out_unlock;
172 } else if (err != 1) {
173 dev_err(ab3100->dev,
174 "write error (send register address)\n"
175 " %d bytes transferred (expected 1)\n",
176 err);
177 err = -EIO;
178 goto get_reg_out_unlock;
179 } else {
180 /* All is well */
181 err = 0;
182 }
183
184 err = i2c_master_recv(ab3100->i2c_client, regval, 1);
185 if (err < 0) {
186 dev_err(ab3100->dev,
187 "write error (read register): %d\n",
188 err);
189 goto get_reg_out_unlock;
190 } else if (err != 1) {
191 dev_err(ab3100->dev,
192 "write error (read register)\n"
193 " %d bytes transferred (expected 1)\n",
194 err);
195 err = -EIO;
196 goto get_reg_out_unlock;
197 } else {
198 /* All is well */
199 err = 0;
200 }
201
202 get_reg_out_unlock:
203 mutex_unlock(&ab3100->access_mutex);
204 return err;
205 }
206
get_register_interruptible(struct device * dev,u8 bank,u8 reg,u8 * value)207 static int get_register_interruptible(struct device *dev, u8 bank, u8 reg,
208 u8 *value)
209 {
210 struct ab3100 *ab3100 = dev_get_drvdata(dev->parent);
211
212 return ab3100_get_register_interruptible(ab3100, reg, value);
213 }
214
ab3100_get_register_page_interruptible(struct ab3100 * ab3100,u8 first_reg,u8 * regvals,u8 numregs)215 static int ab3100_get_register_page_interruptible(struct ab3100 *ab3100,
216 u8 first_reg, u8 *regvals, u8 numregs)
217 {
218 int err;
219
220 if (ab3100->chip_id == 0xa0 ||
221 ab3100->chip_id == 0xa1)
222 /* These don't support paged reads */
223 return -EIO;
224
225 err = mutex_lock_interruptible(&ab3100->access_mutex);
226 if (err)
227 return err;
228
229 /*
230 * Paged read also require an I2C "stop" command.
231 */
232 err = i2c_master_send(ab3100->i2c_client, &first_reg, 1);
233 if (err < 0) {
234 dev_err(ab3100->dev,
235 "write error (send first register address): %d\n",
236 err);
237 goto get_reg_page_out_unlock;
238 } else if (err != 1) {
239 dev_err(ab3100->dev,
240 "write error (send first register address)\n"
241 " %d bytes transferred (expected 1)\n",
242 err);
243 err = -EIO;
244 goto get_reg_page_out_unlock;
245 }
246
247 err = i2c_master_recv(ab3100->i2c_client, regvals, numregs);
248 if (err < 0) {
249 dev_err(ab3100->dev,
250 "write error (read register page): %d\n",
251 err);
252 goto get_reg_page_out_unlock;
253 } else if (err != numregs) {
254 dev_err(ab3100->dev,
255 "write error (read register page)\n"
256 " %d bytes transferred (expected %d)\n",
257 err, numregs);
258 err = -EIO;
259 goto get_reg_page_out_unlock;
260 }
261
262 /* All is well */
263 err = 0;
264
265 get_reg_page_out_unlock:
266 mutex_unlock(&ab3100->access_mutex);
267 return err;
268 }
269
get_register_page_interruptible(struct device * dev,u8 bank,u8 first_reg,u8 * regvals,u8 numregs)270 static int get_register_page_interruptible(struct device *dev, u8 bank,
271 u8 first_reg, u8 *regvals, u8 numregs)
272 {
273 struct ab3100 *ab3100 = dev_get_drvdata(dev->parent);
274
275 return ab3100_get_register_page_interruptible(ab3100,
276 first_reg, regvals, numregs);
277 }
278
ab3100_mask_and_set_register_interruptible(struct ab3100 * ab3100,u8 reg,u8 andmask,u8 ormask)279 static int ab3100_mask_and_set_register_interruptible(struct ab3100 *ab3100,
280 u8 reg, u8 andmask, u8 ormask)
281 {
282 u8 regandval[2] = {reg, 0};
283 int err;
284
285 err = mutex_lock_interruptible(&ab3100->access_mutex);
286 if (err)
287 return err;
288
289 /* First read out the target register */
290 err = i2c_master_send(ab3100->i2c_client, ®, 1);
291 if (err < 0) {
292 dev_err(ab3100->dev,
293 "write error (maskset send address): %d\n",
294 err);
295 goto get_maskset_unlock;
296 } else if (err != 1) {
297 dev_err(ab3100->dev,
298 "write error (maskset send address)\n"
299 " %d bytes transferred (expected 1)\n",
300 err);
301 err = -EIO;
302 goto get_maskset_unlock;
303 }
304
305 err = i2c_master_recv(ab3100->i2c_client, ®andval[1], 1);
306 if (err < 0) {
307 dev_err(ab3100->dev,
308 "write error (maskset read register): %d\n",
309 err);
310 goto get_maskset_unlock;
311 } else if (err != 1) {
312 dev_err(ab3100->dev,
313 "write error (maskset read register)\n"
314 " %d bytes transferred (expected 1)\n",
315 err);
316 err = -EIO;
317 goto get_maskset_unlock;
318 }
319
320 /* Modify the register */
321 regandval[1] &= andmask;
322 regandval[1] |= ormask;
323
324 /* Write the register */
325 err = i2c_master_send(ab3100->i2c_client, regandval, 2);
326 if (err < 0) {
327 dev_err(ab3100->dev,
328 "write error (write register): %d\n",
329 err);
330 goto get_maskset_unlock;
331 } else if (err != 2) {
332 dev_err(ab3100->dev,
333 "write error (write register)\n"
334 " %d bytes transferred (expected 2)\n",
335 err);
336 err = -EIO;
337 goto get_maskset_unlock;
338 }
339
340 /* All is well */
341 err = 0;
342
343 get_maskset_unlock:
344 mutex_unlock(&ab3100->access_mutex);
345 return err;
346 }
347
mask_and_set_register_interruptible(struct device * dev,u8 bank,u8 reg,u8 bitmask,u8 bitvalues)348 static int mask_and_set_register_interruptible(struct device *dev, u8 bank,
349 u8 reg, u8 bitmask, u8 bitvalues)
350 {
351 struct ab3100 *ab3100 = dev_get_drvdata(dev->parent);
352
353 return ab3100_mask_and_set_register_interruptible(ab3100,
354 reg, bitmask, (bitmask & bitvalues));
355 }
356
357 /*
358 * Register a simple callback for handling any AB3100 events.
359 */
ab3100_event_register(struct ab3100 * ab3100,struct notifier_block * nb)360 int ab3100_event_register(struct ab3100 *ab3100,
361 struct notifier_block *nb)
362 {
363 return blocking_notifier_chain_register(&ab3100->event_subscribers,
364 nb);
365 }
366 EXPORT_SYMBOL(ab3100_event_register);
367
368 /*
369 * Remove a previously registered callback.
370 */
ab3100_event_unregister(struct ab3100 * ab3100,struct notifier_block * nb)371 int ab3100_event_unregister(struct ab3100 *ab3100,
372 struct notifier_block *nb)
373 {
374 return blocking_notifier_chain_unregister(&ab3100->event_subscribers,
375 nb);
376 }
377 EXPORT_SYMBOL(ab3100_event_unregister);
378
379
ab3100_event_registers_startup_state_get(struct device * dev,u8 * event)380 static int ab3100_event_registers_startup_state_get(struct device *dev,
381 u8 *event)
382 {
383 struct ab3100 *ab3100 = dev_get_drvdata(dev->parent);
384 if (!ab3100->startup_events_read)
385 return -EAGAIN; /* Try again later */
386 memcpy(event, ab3100->startup_events, 3);
387 return 0;
388 }
389
390 static struct abx500_ops ab3100_ops = {
391 .get_chip_id = ab3100_get_chip_id,
392 .set_register = set_register_interruptible,
393 .get_register = get_register_interruptible,
394 .get_register_page = get_register_page_interruptible,
395 .set_register_page = NULL,
396 .mask_and_set_register = mask_and_set_register_interruptible,
397 .event_registers_startup_state_get =
398 ab3100_event_registers_startup_state_get,
399 .startup_irq_enabled = NULL,
400 };
401
402 /*
403 * This is a threaded interrupt handler so we can make some
404 * I2C calls etc.
405 */
ab3100_irq_handler(int irq,void * data)406 static irqreturn_t ab3100_irq_handler(int irq, void *data)
407 {
408 struct ab3100 *ab3100 = data;
409 u8 event_regs[3];
410 u32 fatevent;
411 int err;
412
413 err = ab3100_get_register_page_interruptible(ab3100, AB3100_EVENTA1,
414 event_regs, 3);
415 if (err)
416 goto err_event;
417
418 fatevent = (event_regs[0] << 16) |
419 (event_regs[1] << 8) |
420 event_regs[2];
421
422 if (!ab3100->startup_events_read) {
423 ab3100->startup_events[0] = event_regs[0];
424 ab3100->startup_events[1] = event_regs[1];
425 ab3100->startup_events[2] = event_regs[2];
426 ab3100->startup_events_read = true;
427 }
428 /*
429 * The notified parties will have to mask out the events
430 * they're interested in and react to them. They will be
431 * notified on all events, then they use the fatevent value
432 * to determine if they're interested.
433 */
434 blocking_notifier_call_chain(&ab3100->event_subscribers,
435 fatevent, NULL);
436
437 dev_dbg(ab3100->dev,
438 "IRQ Event: 0x%08x\n", fatevent);
439
440 return IRQ_HANDLED;
441
442 err_event:
443 dev_dbg(ab3100->dev,
444 "error reading event status\n");
445 return IRQ_HANDLED;
446 }
447
448 #ifdef CONFIG_DEBUG_FS
449 /*
450 * Some debugfs entries only exposed if we're using debug
451 */
ab3100_registers_print(struct seq_file * s,void * p)452 static int ab3100_registers_print(struct seq_file *s, void *p)
453 {
454 struct ab3100 *ab3100 = s->private;
455 u8 value;
456 u8 reg;
457
458 seq_puts(s, "AB3100 registers:\n");
459
460 for (reg = 0; reg < 0xff; reg++) {
461 ab3100_get_register_interruptible(ab3100, reg, &value);
462 seq_printf(s, "[0x%x]: 0x%x\n", reg, value);
463 }
464 return 0;
465 }
466
ab3100_registers_open(struct inode * inode,struct file * file)467 static int ab3100_registers_open(struct inode *inode, struct file *file)
468 {
469 return single_open(file, ab3100_registers_print, inode->i_private);
470 }
471
472 static const struct file_operations ab3100_registers_fops = {
473 .open = ab3100_registers_open,
474 .read = seq_read,
475 .llseek = seq_lseek,
476 .release = single_release,
477 .owner = THIS_MODULE,
478 };
479
480 struct ab3100_get_set_reg_priv {
481 struct ab3100 *ab3100;
482 bool mode;
483 };
484
ab3100_get_set_reg(struct file * file,const char __user * user_buf,size_t count,loff_t * ppos)485 static ssize_t ab3100_get_set_reg(struct file *file,
486 const char __user *user_buf,
487 size_t count, loff_t *ppos)
488 {
489 struct ab3100_get_set_reg_priv *priv = file->private_data;
490 struct ab3100 *ab3100 = priv->ab3100;
491 char buf[32];
492 ssize_t buf_size;
493 int regp;
494 u8 user_reg;
495 int err;
496 int i = 0;
497
498 /* Get userspace string and assure termination */
499 buf_size = min(count, (sizeof(buf)-1));
500 if (copy_from_user(buf, user_buf, buf_size))
501 return -EFAULT;
502 buf[buf_size] = 0;
503
504 /*
505 * The idea is here to parse a string which is either
506 * "0xnn" for reading a register, or "0xaa 0xbb" for
507 * writing 0xbb to the register 0xaa. First move past
508 * whitespace and then begin to parse the register.
509 */
510 while ((i < buf_size) && (buf[i] == ' '))
511 i++;
512 regp = i;
513
514 /*
515 * Advance pointer to end of string then terminate
516 * the register string. This is needed to satisfy
517 * the kstrtou8() function.
518 */
519 while ((i < buf_size) && (buf[i] != ' '))
520 i++;
521 buf[i] = '\0';
522
523 err = kstrtou8(&buf[regp], 16, &user_reg);
524 if (err)
525 return err;
526
527 /* Either we read or we write a register here */
528 if (!priv->mode) {
529 /* Reading */
530 u8 regvalue;
531
532 ab3100_get_register_interruptible(ab3100, user_reg, ®value);
533
534 dev_info(ab3100->dev,
535 "debug read AB3100 reg[0x%02x]: 0x%02x\n",
536 user_reg, regvalue);
537 } else {
538 int valp;
539 u8 user_value;
540 u8 regvalue;
541
542 /*
543 * Writing, we need some value to write to
544 * the register so keep parsing the string
545 * from userspace.
546 */
547 i++;
548 while ((i < buf_size) && (buf[i] == ' '))
549 i++;
550 valp = i;
551 while ((i < buf_size) && (buf[i] != ' '))
552 i++;
553 buf[i] = '\0';
554
555 err = kstrtou8(&buf[valp], 16, &user_value);
556 if (err)
557 return err;
558
559 ab3100_set_register_interruptible(ab3100, user_reg, user_value);
560 ab3100_get_register_interruptible(ab3100, user_reg, ®value);
561
562 dev_info(ab3100->dev,
563 "debug write reg[0x%02x]\n"
564 " with 0x%02x, after readback: 0x%02x\n",
565 user_reg, user_value, regvalue);
566 }
567 return buf_size;
568 }
569
570 static const struct file_operations ab3100_get_set_reg_fops = {
571 .open = simple_open,
572 .write = ab3100_get_set_reg,
573 .llseek = noop_llseek,
574 };
575
576 static struct dentry *ab3100_dir;
577 static struct dentry *ab3100_reg_file;
578 static struct ab3100_get_set_reg_priv ab3100_get_priv;
579 static struct dentry *ab3100_get_reg_file;
580 static struct ab3100_get_set_reg_priv ab3100_set_priv;
581 static struct dentry *ab3100_set_reg_file;
582
ab3100_setup_debugfs(struct ab3100 * ab3100)583 static void ab3100_setup_debugfs(struct ab3100 *ab3100)
584 {
585 int err;
586
587 ab3100_dir = debugfs_create_dir("ab3100", NULL);
588 if (!ab3100_dir)
589 goto exit_no_debugfs;
590
591 ab3100_reg_file = debugfs_create_file("registers",
592 S_IRUGO, ab3100_dir, ab3100,
593 &ab3100_registers_fops);
594 if (!ab3100_reg_file) {
595 err = -ENOMEM;
596 goto exit_destroy_dir;
597 }
598
599 ab3100_get_priv.ab3100 = ab3100;
600 ab3100_get_priv.mode = false;
601 ab3100_get_reg_file = debugfs_create_file("get_reg",
602 S_IWUSR, ab3100_dir, &ab3100_get_priv,
603 &ab3100_get_set_reg_fops);
604 if (!ab3100_get_reg_file) {
605 err = -ENOMEM;
606 goto exit_destroy_reg;
607 }
608
609 ab3100_set_priv.ab3100 = ab3100;
610 ab3100_set_priv.mode = true;
611 ab3100_set_reg_file = debugfs_create_file("set_reg",
612 S_IWUSR, ab3100_dir, &ab3100_set_priv,
613 &ab3100_get_set_reg_fops);
614 if (!ab3100_set_reg_file) {
615 err = -ENOMEM;
616 goto exit_destroy_get_reg;
617 }
618 return;
619
620 exit_destroy_get_reg:
621 debugfs_remove(ab3100_get_reg_file);
622 exit_destroy_reg:
623 debugfs_remove(ab3100_reg_file);
624 exit_destroy_dir:
625 debugfs_remove(ab3100_dir);
626 exit_no_debugfs:
627 return;
628 }
ab3100_remove_debugfs(void)629 static inline void ab3100_remove_debugfs(void)
630 {
631 debugfs_remove(ab3100_set_reg_file);
632 debugfs_remove(ab3100_get_reg_file);
633 debugfs_remove(ab3100_reg_file);
634 debugfs_remove(ab3100_dir);
635 }
636 #else
ab3100_setup_debugfs(struct ab3100 * ab3100)637 static inline void ab3100_setup_debugfs(struct ab3100 *ab3100)
638 {
639 }
ab3100_remove_debugfs(void)640 static inline void ab3100_remove_debugfs(void)
641 {
642 }
643 #endif
644
645 /*
646 * Basic set-up, datastructure creation/destruction and I2C interface.
647 * This sets up a default config in the AB3100 chip so that it
648 * will work as expected.
649 */
650
651 struct ab3100_init_setting {
652 u8 abreg;
653 u8 setting;
654 };
655
656 static const struct ab3100_init_setting ab3100_init_settings[] = {
657 {
658 .abreg = AB3100_MCA,
659 .setting = 0x01
660 }, {
661 .abreg = AB3100_MCB,
662 .setting = 0x30
663 }, {
664 .abreg = AB3100_IMRA1,
665 .setting = 0x00
666 }, {
667 .abreg = AB3100_IMRA2,
668 .setting = 0xFF
669 }, {
670 .abreg = AB3100_IMRA3,
671 .setting = 0x01
672 }, {
673 .abreg = AB3100_IMRB1,
674 .setting = 0xBF
675 }, {
676 .abreg = AB3100_IMRB2,
677 .setting = 0xFF
678 }, {
679 .abreg = AB3100_IMRB3,
680 .setting = 0xFF
681 }, {
682 .abreg = AB3100_SUP,
683 .setting = 0x00
684 }, {
685 .abreg = AB3100_DIS,
686 .setting = 0xF0
687 }, {
688 .abreg = AB3100_D0C,
689 .setting = 0x00
690 }, {
691 .abreg = AB3100_D1C,
692 .setting = 0x00
693 }, {
694 .abreg = AB3100_D2C,
695 .setting = 0x00
696 }, {
697 .abreg = AB3100_D3C,
698 .setting = 0x00
699 },
700 };
701
ab3100_setup(struct ab3100 * ab3100)702 static int ab3100_setup(struct ab3100 *ab3100)
703 {
704 int err = 0;
705 int i;
706
707 for (i = 0; i < ARRAY_SIZE(ab3100_init_settings); i++) {
708 err = ab3100_set_register_interruptible(ab3100,
709 ab3100_init_settings[i].abreg,
710 ab3100_init_settings[i].setting);
711 if (err)
712 goto exit_no_setup;
713 }
714
715 /*
716 * Special trick to make the AB3100 use the 32kHz clock (RTC)
717 * bit 3 in test register 0x02 is a special, undocumented test
718 * register bit that only exist in AB3100 P1E
719 */
720 if (ab3100->chip_id == 0xc4) {
721 dev_warn(ab3100->dev,
722 "AB3100 P1E variant detected forcing chip to 32KHz\n");
723 err = ab3100_set_test_register_interruptible(ab3100,
724 0x02, 0x08);
725 }
726
727 exit_no_setup:
728 return err;
729 }
730
731 /* The subdevices of the AB3100 */
732 static struct mfd_cell ab3100_devs[] = {
733 {
734 .name = "ab3100-dac",
735 .id = -1,
736 },
737 {
738 .name = "ab3100-leds",
739 .id = -1,
740 },
741 {
742 .name = "ab3100-power",
743 .id = -1,
744 },
745 {
746 .name = "ab3100-regulators",
747 .of_compatible = "stericsson,ab3100-regulators",
748 .id = -1,
749 },
750 {
751 .name = "ab3100-sim",
752 .id = -1,
753 },
754 {
755 .name = "ab3100-uart",
756 .id = -1,
757 },
758 {
759 .name = "ab3100-rtc",
760 .id = -1,
761 },
762 {
763 .name = "ab3100-charger",
764 .id = -1,
765 },
766 {
767 .name = "ab3100-boost",
768 .id = -1,
769 },
770 {
771 .name = "ab3100-adc",
772 .id = -1,
773 },
774 {
775 .name = "ab3100-fuelgauge",
776 .id = -1,
777 },
778 {
779 .name = "ab3100-vibrator",
780 .id = -1,
781 },
782 {
783 .name = "ab3100-otp",
784 .id = -1,
785 },
786 {
787 .name = "ab3100-codec",
788 .id = -1,
789 },
790 };
791
792 struct ab_family_id {
793 u8 id;
794 char *name;
795 };
796
797 static const struct ab_family_id ids[] = {
798 /* AB3100 */
799 {
800 .id = 0xc0,
801 .name = "P1A"
802 }, {
803 .id = 0xc1,
804 .name = "P1B"
805 }, {
806 .id = 0xc2,
807 .name = "P1C"
808 }, {
809 .id = 0xc3,
810 .name = "P1D"
811 }, {
812 .id = 0xc4,
813 .name = "P1E"
814 }, {
815 .id = 0xc5,
816 .name = "P1F/R1A"
817 }, {
818 .id = 0xc6,
819 .name = "P1G/R1A"
820 }, {
821 .id = 0xc7,
822 .name = "P2A/R2A"
823 }, {
824 .id = 0xc8,
825 .name = "P2B/R2B"
826 },
827 /* AB3000 variants, not supported */
828 {
829 .id = 0xa0
830 }, {
831 .id = 0xa1
832 }, {
833 .id = 0xa2
834 }, {
835 .id = 0xa3
836 }, {
837 .id = 0xa4
838 }, {
839 .id = 0xa5
840 }, {
841 .id = 0xa6
842 }, {
843 .id = 0xa7
844 },
845 /* Terminator */
846 {
847 .id = 0x00,
848 },
849 };
850
ab3100_probe(struct i2c_client * client,const struct i2c_device_id * id)851 static int ab3100_probe(struct i2c_client *client,
852 const struct i2c_device_id *id)
853 {
854 struct ab3100 *ab3100;
855 struct ab3100_platform_data *ab3100_plf_data =
856 dev_get_platdata(&client->dev);
857 int err;
858 int i;
859
860 ab3100 = devm_kzalloc(&client->dev, sizeof(struct ab3100), GFP_KERNEL);
861 if (!ab3100) {
862 dev_err(&client->dev, "could not allocate AB3100 device\n");
863 return -ENOMEM;
864 }
865
866 /* Initialize data structure */
867 mutex_init(&ab3100->access_mutex);
868 BLOCKING_INIT_NOTIFIER_HEAD(&ab3100->event_subscribers);
869
870 ab3100->i2c_client = client;
871 ab3100->dev = &ab3100->i2c_client->dev;
872
873 i2c_set_clientdata(client, ab3100);
874
875 /* Read chip ID register */
876 err = ab3100_get_register_interruptible(ab3100, AB3100_CID,
877 &ab3100->chip_id);
878 if (err) {
879 dev_err(&client->dev,
880 "failed to communicate with AB3100 chip\n");
881 goto exit_no_detect;
882 }
883
884 for (i = 0; ids[i].id != 0x0; i++) {
885 if (ids[i].id == ab3100->chip_id) {
886 if (ids[i].name != NULL) {
887 snprintf(&ab3100->chip_name[0],
888 sizeof(ab3100->chip_name) - 1,
889 "AB3100 %s",
890 ids[i].name);
891 break;
892 } else {
893 dev_err(&client->dev,
894 "AB3000 is not supported\n");
895 goto exit_no_detect;
896 }
897 }
898 }
899
900 if (ids[i].id == 0x0) {
901 dev_err(&client->dev, "unknown analog baseband chip id: 0x%x\n",
902 ab3100->chip_id);
903 dev_err(&client->dev,
904 "accepting it anyway. Please update the driver.\n");
905 goto exit_no_detect;
906 }
907
908 dev_info(&client->dev, "Detected chip: %s\n",
909 &ab3100->chip_name[0]);
910
911 /* Attach a second dummy i2c_client to the test register address */
912 ab3100->testreg_client = i2c_new_dummy(client->adapter,
913 client->addr + 1);
914 if (!ab3100->testreg_client) {
915 err = -ENOMEM;
916 goto exit_no_testreg_client;
917 }
918
919 err = ab3100_setup(ab3100);
920 if (err)
921 goto exit_no_setup;
922
923 err = devm_request_threaded_irq(&client->dev,
924 client->irq, NULL, ab3100_irq_handler,
925 IRQF_ONESHOT, "ab3100-core", ab3100);
926 if (err)
927 goto exit_no_irq;
928
929 err = abx500_register_ops(&client->dev, &ab3100_ops);
930 if (err)
931 goto exit_no_ops;
932
933 /* Set up and register the platform devices. */
934 for (i = 0; i < ARRAY_SIZE(ab3100_devs); i++) {
935 ab3100_devs[i].platform_data = ab3100_plf_data;
936 ab3100_devs[i].pdata_size = sizeof(struct ab3100_platform_data);
937 }
938
939 err = mfd_add_devices(&client->dev, 0, ab3100_devs,
940 ARRAY_SIZE(ab3100_devs), NULL, 0, NULL);
941
942 ab3100_setup_debugfs(ab3100);
943
944 return 0;
945
946 exit_no_ops:
947 exit_no_irq:
948 exit_no_setup:
949 i2c_unregister_device(ab3100->testreg_client);
950 exit_no_testreg_client:
951 exit_no_detect:
952 return err;
953 }
954
ab3100_remove(struct i2c_client * client)955 static int ab3100_remove(struct i2c_client *client)
956 {
957 struct ab3100 *ab3100 = i2c_get_clientdata(client);
958
959 /* Unregister subdevices */
960 mfd_remove_devices(&client->dev);
961 ab3100_remove_debugfs();
962 i2c_unregister_device(ab3100->testreg_client);
963 return 0;
964 }
965
966 static const struct i2c_device_id ab3100_id[] = {
967 { "ab3100", 0 },
968 { }
969 };
970 MODULE_DEVICE_TABLE(i2c, ab3100_id);
971
972 static struct i2c_driver ab3100_driver = {
973 .driver = {
974 .name = "ab3100",
975 .owner = THIS_MODULE,
976 },
977 .id_table = ab3100_id,
978 .probe = ab3100_probe,
979 .remove = ab3100_remove,
980 };
981
ab3100_i2c_init(void)982 static int __init ab3100_i2c_init(void)
983 {
984 return i2c_add_driver(&ab3100_driver);
985 }
986
ab3100_i2c_exit(void)987 static void __exit ab3100_i2c_exit(void)
988 {
989 i2c_del_driver(&ab3100_driver);
990 }
991
992 subsys_initcall(ab3100_i2c_init);
993 module_exit(ab3100_i2c_exit);
994
995 MODULE_AUTHOR("Linus Walleij <linus.walleij@stericsson.com>");
996 MODULE_DESCRIPTION("AB3100 core driver");
997 MODULE_LICENSE("GPL");
998